Express each radical in exponential form. Simplify using the exponent laws when possible.
a) √k^2/3
b √ab^2
c 4√81x^8y^12
√k = k^(1/2)
so, √k^2/3 = k^(1/2 * 2/3) = k^1/3
√(ab^2) = √(a * b^2) = √a * √b^2 = √a*b = a^(1/2) b
4√(√81x^8y^12) = 4(9x^4y^6) = 36x^4y^6